World War I and II Had passed. All the countries tied in United Nation. However recently there seem grouping countries. They join in the military coalition. Islamic countries have allied. Some comunists countries also take position with the winning Russia in Syria helped by Iran.
US , China and other super power countries may prepare all the possibilities. Will World War III Problably happen? Where will it start from?
If World War III would occur then human extinction is inevitable. With the presence of nuclear weapons around the world, nuclear holocaust would happen and everybody is in a no win situation that is why i think that it would not happen.
It is not certain though. Almost a dozen nations have nuclear capability now, including rogue nations such as Pakistan and North Korea. It will depend a lot on the sides participating in the war. If it is between the Muslims and the Christians, then there are high chances that the Pak nuclear weapons will end up with the ISIS or the Al Qaeda.